Clarify last/past wording

This is more consistent with the descriptions and tooltips.
Remove sample SQLite config

SQLite is no longer used. This value is not even used in the SQLite
migration script.
Fix column name case

If the column name is quoted it is case-sensitive, and this one is
lower-case like the rest.
Decrease HTL to fit instantaneous network size

20 was chosen with the help of simulation. See the partial results at
http://imgur.com/a/1jdcY#2
The ideal distribution in this case is 1/7000 (0.0001428...) appearances
per node.

The routing simulator used was
https://github.com/Thynix/routing-simulator on the peer-percentage
branch - specifically 09e6eb65f6d6de0226b5024b77d4d61f7c7247a8.

The command line was:
java -jar target/routing_simulator-0.0.1-dev-jar-with-dependencies.jar
     --flat-link --conforming-degree peer-count.txt --size 7000
     --output-probe htl-sim/ --probe 30 --metropolis-hastings

where peer-count.txt contains a peer count histogram of results between
2013-12-17 and 2013-12-18. This gives a simulation of
Metropolis-Hastings corrected probes routing on a network of 7000 with
degree distribution matching measurement.
Log identifier used for insert
Whitespace
Use stacked area for errors plot

This should make it easier to get an impression of the total error count.
It should probably be a percentage of the total number of probes sent
eventually.
Add news entry